Populus trichocarpa

black cottonwood

Family:Salicaceae

Rarity

CNPS-EB: C

13 current natural populations

Criteria:

Limited/Threatened Habitat
Small Populations

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Populus
- Populus trichocarpa
CCH2

Key

Ecology

Flowers February - April

Habitats:

Riparian

References

Synonyms

Populus balsamifera subsp. trichocarpa

Populations

Key

Location	Pop ID	Last Recorded	Notes
Niles Canyon area	3	2004-07-24
Oakland Hills - North	5	2009-10-29
Oakland Hills - North	6	2013-06-09
Pittsburg - other or unknown sites	7	2002-10-08
Richmond - other or unknown sites	8	2007-04-22
Richmond - other or unknown sites	9	2007-04-23
Richmond - other or unknown sites	10	2007-04-22
San Antonio Reservoir - SFWD	13	2004-06-09
San Francisco Water District land, Sunol	12	2009-12-31
San Leandro Creek South - EBMUD	14	2021-03-27
San Pablo Area	16	2007-04-16
Sunol Valley	18	2021-05-12
Sycamore Grove Rgnl Park - LAPRD	19	2001-12-31
Chabot Rgnl Park	1	1999-12-31	Historic
Las Trampas Creek, Lafayette	2	1994-12-31	Historic
Oakland - other or unknown sites	4	1998-12-31	Historic
Redwood Rgnl Park	11	1993-02-28	Historic
San Leandro Reservoir - EBMUD	15	1996-05-09	Historic
San Ramon, W of 680	17	1998-12-31	Historic

The list of populations shows the distinct populations identified by the CNPS-EB Rare and Unusual Plants Committee. The locations in this list are very general. More specific location details can be obtained from the links in the Observations section (for some of these links, a login is required).

Font

Populations in bold type have precise coordinates available for field volunteers and researchers.

Populations in normal type are only known from a description of the location; no precise coordinates are available.

Background

Populations with a white background have been observed in the last 25 years.

Populations with a blue background have not been observed for at least 25 years.

Populations with an orange background have an uncertain location or identification, or are planted.

Columns

Pop ID is a label that identifies the population. Many locations have more than one population of a species, and the population ID is used to distinguish them.